"Nothing much. Only Mary is going away, and I had expected her to be at the test," Tom answered.
"Going away?" echoed Ned. "For long?"
"Oh, no, only for a couple of weeks. She is going to visit an uncle and aunt in Newmarket, or just outside of that city. Another uncle, Barton Keith, has offices in the Landmark Building, I believe."
"Landmark Building," murmured Ned. "Isn't that where Field and Melling hang out?"
"Yes. But don't mention Mary's uncle in connection with them," laughed Tom. "He wouldn't like it."
"I should say not!"
Ned well remembered Mary's uncle, who had been associated with Tom in recovering the treasure in the undersea search.
"Well, if she can't be here, she can't," said Tom, as philosophically as possible. "I'd better run over and bid her goodbye."
This Tom did, though Ned noticed that his chum acted as though lonesome on his return.
"But when he gets to work testing his new chemical he'll be all right," decided Ned.